Steam boiler



July 7, 1931. w. s. MONROE STEAM BOILER Filed May 4, 1925 2 Sheets-Sheet1 I HHHHHHU IH INVENTOR.

ATTORNEYJ July 7, 1931.

W. s. MONROE 1,813,504

STEAM BOILER Filed May 4, 1925 2 Sheets-Sheet 2 INVENTOR.

A TTORNEYS Patented July 7, 1931 UNITED- STATES PATENT OFFICE WILLIAM S.MONROE, OF CHICAGO, ILLINOIS ASSIGNOR, BY MESNE ASSIGNMENTS, TO

I'UILER LEHIGH COMPANY, A CORPORATION, OF DELAWARE arm BonnieApplication filed lay-1,

of my invention, and Fig. 2 is a. front eleva tion, with some of theparts broken away.- 'Like reference characters indicate like parts inthe different views. 1

' In the illustrative embodiment, the boiler has an upper steam andwater drum con-.

nected in the usual manner to downtake headers-11 and uptake headers 12which, in turn, are connected by a bank of horizontally inclined watertubes 13 indicated more or less. diagrammatically in Fig. 1, the boileralso having arow of water tubes 14 separated from-the main bank 13 toform a chamber 15.

no Extending along the row of tubes 14 from the downtake headers 11 is abaflle 16, from the inner end of which extends upwardlyand at an angleto the vertical, a transverse baflle 17. A baflie 18 divides theremainder" 28 of the gas' passages in the second and third passes. Abovethe water tubes 13 is a Superheater 19.

Below the boiler is a furnace chamber which, in the illustrativeembodiment, is pro-. so vided with a chain grate stoker 20 which islocated at the front of the combustion chamher. with a combustion arch21 suspended thereover, so that the gases are directed from the fronttoward the rear of the combustion chamber and follow a curved path asthey rise to the boiler gas inlet formed between the baflle l7 and theheaders 12, which inlet, it will be noted, is adjacent the rear of thefurnace chamber.

In .order to maintain the furnace walls, especially whenthe furnace isoperated under high pressure, I provide cooling tubes 22 connected withthe boiler, these cooling tubes preferably extending along the innerface of each of the side walls and separated there- ,from, as shown bestin Fig. 2.

In the illustrative embodiment, a lower horizontal header 23 is placedoutside of each of the side walls of the furnace, and

correspondingly a substantially horizontal,

:side walls, as shown best in Fig.2.

1925. Serial No. 27,704.

though slightly inclined, upper header 24 is similarly placed at theupper'partof the furance chamber and preferably adjacent the boiler gasinlet and spaced longitudinally from the header 23. y The cooling tubes22 connect the headers 23- and 24 and, in order to have the main portionof the tubes, 22 inside of theside walls, I bend the ends of the tubes22 outward so as. to extend throu h tile t t e point where each tubeleaves the furnace wall there is preferably provided an expansion jointand the openings for the tubes are made large enough so as to permitrelative movement between the tubes and the wall, as plainly shown inFig. 2. The joint may be of any suitable form and is shownconventionally in Fig. 2, as a plate having apertures through which thetubes pass and which covers the openings in the .wall. This furnishes aseal which prevents the escape'of gas while ermitting the relativemotionreferred to a ve. Each header 24 is connected through apipe 25, ajunction box 26 and a plurality of small tubes 27 to the steam andwater. drum 10, the pipe 25 connecting with the high end of the header24. Similarly, each .header 23 is connected through a pipe 28, ajunction box 29 and a plurality of pipes 30 to the drum 10.

It will be obvious that the tubes 22 are therefore connected with thewater spaces of the boiler, so that as the water in these tubes isheated, it will rise through the headers 24 and the pipes connectedtherewith and flow as steam and water into thedrum 10, K

the water so displaced. in the tubes 22 being made up b water flowingfrom the drum 10 down to t e header 23 and from thence up through thetubes 22. 1

In order to maintain the side walls efl'ectively, I preferably arrangethe tubes 22 so connected by reverse bends. Since the header 23 isadjacent the stoker at the front of the furnace chamber and the header24 adjacent to the vertical and still connect the headers 23 and 24, Ipreferably provide the straight portions and the reverse bendsconnecting them so that any inequalities in expansion may be taken careof, and, at the same time,

the tubes 22 may be arranged as may be desired, in order, to have themfollow as closely as possible the lines of flow of the gases.

It will also be noted that by the arrangement which I have described,the water in the cooling tubes 22 has a free opportunity to rise readilywithout forming steam pockets which might shut off the watercirculation,

- m The inclination of the header 24cpermits any steam which is carriedinto that header to rise readily'through the pipe 25 and from thenceflow to the drum 10. Thus the ar-.

rangement which I have described provides a means by which the generalpath of the combustion gases in the furnace chamber can be paralleled,so to speak, by the cooling tubes, and, at the same time, these tubes bearranged so that a free and easy circulation therethrough can bemaintained.

In the illustrative embodiment, the Stoker 20 is provided with side wallwater boxes 31 connected at their front ends by pipes 32 to the downtakeboiler mud drum 33 and by pipes 34 to the uptake header boxes 35. A rearwater box 36 has one end connected by pipe 37 with the box and the otherend by pipe 38 with the end of mud drum 33. Itv

will be seen that the side and rear water boxes are connected to thewater circulation so that the water may circulate freely through themand that the connections to the water boxes and to the side wall coolingtubes are independent of each other so that the circulation in the onewill not interfere with the circulation in the other. -By locating theside wall water boxes 31 beneath the lower out-turned ends of thecooling tubes 22, as shown, the side wall is cooled throughout itsheight without necessitating carrying the cooling tubes too close to thefuel bed on the stoker 20.

It will be understood that the arrangement which I have described-ismerely "illustrative and that its embodiment may be widely varied.

Iclaim:

1. In combination, a furnace chamber, a steam boiler over said chamber,with the gas inlet to the boiler adjacent the upper rear portion of thechamber, a grate adjacent the lower front portion of the furnacechamber, whereby the gases move from the front to the rear of thefurnace chamber as they flow upward, cooling tubes adjacent thesidewalls of the furnace and extending generally in lower headers at thesides the direction of travel of the gases in the furnace, upper andlower headers connecting the I portion'of the chamber, a grate adjacentthe lower front portion of the furnace chamber, whereby the gases movefrom the front to the rear of the furnace chamber as they flow upward,substantially horizontal upper and lowor headers at the sides of thefurnace chamher, the lower header being adjacent the grate and the upperheader adjacent the boiler gas inlet, coolin tubes adjacent the sidewallsof the cham er and connecting the headers and extending generallyin the direction of travel of the gases in the furnace, and connectionsbetween the headers and the boiler.

3. In combination, a furnace chamber, a steam boiler over said chamber,with the gas inlet to the boiler adjacent the upper rear portion of thechamber, a grate adjacent the lower front portion of the furnacechamber, whereby the gases move from the front to the rear of thefurnace chamber as they flow upward, substantially horizontal upper andlower headers at the sides of the furnace chamber, the lowerheader beingadjacent the grate and the upper header adjacent the boiler gas inlet,cooling tubes adjacent the side walls of ,the chamber and connecting theheaders and direction of travel of the gases in the furnace,

having straight vertical end portions and a reverse curve connecting thestraight end portions, and connections between the headers and theboiler.

4. In combination, a furnace chamber, a steam boiler over said chamber,with the gas inlet to the boiler adjacent the upper rear portion of thechamber, a grate adjacent the lower front portion of the furnacechamber, whereby the gases move from the front to the rear of thefurnace chamber as they flow upward, substantially horizontal upper andchamber, the lower header being adjacent the grate and the upper headeradjacent the boiler gas inlet, cooling tubes partly within said chamberadjacent the side walls of the chamber and connecting the headers andextending generally in the direction of travel of the gases in thefurnace, and connections between exterior of the side walls and theends'ofsaid cooling tubes being curved outwardly and extending throughsaid walls. a

5. In combination, a, furnace chamber, a steam boiler over said chamber,with the gas inlet to the boiler adj-acent the upper rear portion of thechamber, a grate adjacent the lower front portion of the furnacechamber, whereby the gases move from the front to the of the furnace-12d the headers and the boiler, said headers being i rear of the furnacechamber as they flow upward, a horizontal lower header and an inclinedupper header outside the side wall of the furnace chamber, with thelower header adjacent the grate and the upper header adjacent the boilergas inlet, cooling tubes adj acent the furnace wall and connecting theheaders and extending generally in the direction of travel of the gasesin the furnace, connections between the lower header and the waterspaces of the boiler and connections between the high end of the upperheader and the steam and Water spaces of the boiler.

6. in combination, a furnace chamber, means causing gases passingthrough said chamber to follow a curved path, and water tubes adjacent.the side walls of said chamber, and disposed generally parallel to saidpath substantially throughout their lengths.

'Z. in combination, a furnace chamber, a grate disposed adjacent thebottom thereof, a Water header disposed adjacent a wall of said chamberand adjacent said grate, a gas pass to conduct the gases out of saidchamber, a Water header disposed adjacent said pass and adjacent saidwall. and water tubes connecting said headers, said headers being spacedlongitudinally from each other, and said tubes being formed with reversecurves therein.

8. In combination, a furnace chamber hav ing a chain grate stokeradjacent the bottom thereof means causing gases passing from the stokerto follow a curved path, a row of water tubes parallel to the length ofthe stoker and adjacent the side Walls of said chamber and extendingdownwardly to a position a short distance above the stoker, andextending upwardly in a direction generally parallel to that of thegases risingfrom said WILLIAM S. MONROE.

stoke-r.

